Transcript for Paula Broadwell: The Woman Who Shocked the Political World

And as we said, we're also learning more about the wife and mother at the center of the scandal, paula broadwell. And abc's sharyn alfonsi now has those new details. Reporter: Her north dakota class mates voted her most likely to be remembered. But no one thought it would be for this. Paula broadwell was exceptional. High school valedictorian. Homecoming queen. West point cadet. And later, a graduate student at harvard. Where a chance meeting with petraeus would change everything. On c-span, revealing she approached him about researching she was doing. And he was kind enough to take the paper and give me his business card. Reporter: That research led to a book and later, a book tour. Broadwell was reportedly having an affair at petraeus the same time she was out promoting her book about him. Is he awesome or incredibly awesome? He can turn water into bottled water. Reporter: The 40-year-old often admired for he biceps as much as her brains, then had push up contest with jon stewart. Her husband scott joining in. Six, seven, eight. Reporter: Those book tour interviews now being viewed and revi reviewed. It's not -- I'm not in love with david petraeus. I know holly, his wife, read it and she had great things to say. Reporter: But as high octane as broadwell ran, helping demonstrate and sell guns in this infomercial for criss arms. On the individual fighter, reducing weight is critical. Reporter: Neighbors saw something else. A loving mother. A doting wife. She and her husband, i observed, had a really good, affecti affectionate relationship. It was often you would see them having, with their kids, candlelight dinners. Reporter: Their boys, ages 4 and 6. Their charlotte home now dark. A note etched in chalk left on their driveway. Neighbors say the family hasn't been seen in days. Diane? Thank you so much, sharyn. And now we move onto a very

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